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  2. Egyptian calendar - Wikipedia

    en.wikipedia.org/wiki/Egyptian_calendar

    The Nile flood at Cairo c. 1830.. Current understanding of the earliest development of the Egyptian calendar remains speculative. A tablet from the reign of the First Dynasty pharaoh Djer (c. 3000 BC) was once thought to indicate that the Egyptians had already established a link between the heliacal rising of Sirius (Ancient Egyptian: Spdt or Sopdet, "Triangle"; Ancient Greek: Σῶθις ...

  3. Egyptian astronomy - Wikipedia

    en.wikipedia.org/wiki/Egyptian_astronomy

    Egyptian astronomy dates back to prehistoric times. The presence of stone circles at Nabta Playa in Upper Egypt from the 5th millennium BCE show the importance of astronomy to the religious life of ancient Egypt , even in the prehistoric period.

  4. Sothic cycle - Wikipedia

    en.wikipedia.org/wiki/Sothic_cycle

    [7]: 51 However, this date is too late for Djer's reign, so many scholars believe that it indicates a correlation between the rising of Sirius and the Egyptian lunar calendar, instead of the solar Egyptian civil calendar, which would render the tablet essentially devoid of chronological value. [7]: 52 Gautschy et al. (2017) claimed that a newly ...

  5. Decan - Wikipedia

    en.wikipedia.org/wiki/Decan

    'Diagonal star table' from the late 11th Dynasty coffin lid; found at Asyut, Egypt. Roemer- und Pelizaeus-Museum Hildesheim. The decans (/ ˈ d ɛ k ən z /; Egyptian bꜣktw or baktiu, "[those] connected with work" [1]) are 36 groups of stars (small constellations) used in the ancient Egyptian astronomy to conveniently divide the 360 degree ecliptic into 36 parts of 10 degrees each, both for ...

  6. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  7. Timeline of astronomy - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_astronomy

    This is a timeline of astronomy. It covers ancient, medieval, Renaissance-era, and finally modern astronomy. Antiquity. 1500 BCE. Ancient Indian text mentions Moon ...

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  9. Egyptian chronology - Wikipedia

    en.wikipedia.org/wiki/Egyptian_chronology

    This is a famous conundrum not just in Egyptian but also in Aegean chronology, as the radiocarbon date for the eruption, between 1627 and 1600 BC (p=5%), [16] is off by a full century compared to the date traditionally accepted in archaeology of c. 1500 BC.